1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card (at) masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _LINUX_EXT2_FS_H 17 #define _LINUX_EXT2_FS_H 18 19 #include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ 20 21 /* 22 * The second extended filesystem constants/structures 23 */ 24 25 /* 26 * Define EXT2FS_DEBUG to produce debug messages 27 */ 28 #undef EXT2FS_DEBUG 29 30 /* 31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 32 */ 33 #define EXT2_PREALLOCATE 34 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 35 36 /* 37 * The second extended file system version 38 */ 39 #define EXT2FS_DATE "95/08/09" 40 #define EXT2FS_VERSION "0.5b" 41 42 /* 43 * Special inode numbers 44 */ 45 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 46 #define EXT2_ROOT_INO 2 /* Root inode */ 47 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 48 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 49 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 50 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 51 #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 52 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 53 #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ 54 #define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */ 55 56 /* First non-reserved inode for old ext2 filesystems */ 57 #define EXT2_GOOD_OLD_FIRST_INO 11 58 59 /* 60 * The second extended file system magic number 61 */ 62 #define EXT2_SUPER_MAGIC 0xEF53 63 64 #ifdef __KERNEL__ 65 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 66 #else 67 /* Assume that user mode programs are passing in an ext2fs superblock, not 68 * a kernel struct super_block. This will allow us to call the feature-test 69 * macros from user land. */ 70 #define EXT2_SB(sb) (sb) 71 #endif 72 73 /* 74 * Maximal count of links to a file 75 */ 76 #define EXT2_LINK_MAX 65000 77 78 /* 79 * Macro-instructions used to manage several block sizes 80 */ 81 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 82 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 83 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 84 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 85 #ifdef __KERNEL__ 86 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 87 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 88 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 89 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 90 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 91 #else 92 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 93 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 94 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 95 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 96 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 97 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 98 #endif 99 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 100 101 /* 102 * Macro-instructions used to manage allocation clusters 103 */ 104 #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 105 #define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ 106 #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE 107 #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) 108 #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ 109 (s)->s_log_cluster_size) 110 #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) 111 112 /* 113 * Macro-instructions used to manage fragments 114 * 115 * Note: for backwards compatibility only, for the dump program. 116 * Ext2/3/4 will never support fragments.... 117 */ 118 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 119 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 120 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 121 #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) 122 #define EXT2_FRAGS_PER_BLOCK(s) 1 123 124 /* 125 * ACL structures 126 */ 127 struct ext2_acl_header /* Header of Access Control Lists */ 128 { 129 __u32 aclh_size; 130 __u32 aclh_file_count; 131 __u32 aclh_acle_count; 132 __u32 aclh_first_acle; 133 }; 134 135 struct ext2_acl_entry /* Access Control List Entry */ 136 { 137 __u32 acle_size; 138 __u16 acle_perms; /* Access permissions */ 139 __u16 acle_type; /* Type of entry */ 140 __u16 acle_tag; /* User or group identity */ 141 __u16 acle_pad1; 142 __u32 acle_next; /* Pointer on next entry for the */ 143 /* same inode or on next free entry */ 144 }; 145 146 /* 147 * Structure of a blocks group descriptor 148 */ 149 struct ext2_group_desc 150 { 151 __u32 bg_block_bitmap; /* Blocks bitmap block */ 152 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 153 __u32 bg_inode_table; /* Inodes table block */ 154 __u16 bg_free_blocks_count; /* Free blocks count */ 155 __u16 bg_free_inodes_count; /* Free inodes count */ 156 __u16 bg_used_dirs_count; /* Directories count */ 157 __u16 bg_flags; 158 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 159 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 160 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 161 __u16 bg_itable_unused; /* Unused inodes count */ 162 __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/ 163 }; 164 165 /* 166 * Structure of a blocks group descriptor 167 */ 168 struct ext4_group_desc 169 { 170 __u32 bg_block_bitmap; /* Blocks bitmap block */ 171 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 172 __u32 bg_inode_table; /* Inodes table block */ 173 __u16 bg_free_blocks_count; /* Free blocks count */ 174 __u16 bg_free_inodes_count; /* Free inodes count */ 175 __u16 bg_used_dirs_count; /* Directories count */ 176 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 177 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 178 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 179 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 180 __u16 bg_itable_unused; /* Unused inodes count */ 181 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 182 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 183 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 184 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 185 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 186 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 187 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 188 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 189 __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 190 __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 191 __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 192 __u32 bg_reserved; 193 }; 194 195 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 196 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 197 sizeof(__u16)) 198 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \ 199 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 200 sizeof(__u16)) 201 202 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 203 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 204 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 205 206 /* 207 * Data structures used by the directory indexing feature 208 * 209 * Note: all of the multibyte integer fields are little endian. 210 */ 211 212 /* 213 * Note: dx_root_info is laid out so that if it should somehow get 214 * overlaid by a dirent the two low bits of the hash version will be 215 * zero. Therefore, the hash version mod 4 should never be 0. 216 * Sincerely, the paranoia department. 217 */ 218 struct ext2_dx_root_info { 219 __u32 reserved_zero; 220 __u8 hash_version; /* 0 now, 1 at release */ 221 __u8 info_length; /* 8 */ 222 __u8 indirect_levels; 223 __u8 unused_flags; 224 }; 225 226 #define EXT2_HASH_LEGACY 0 227 #define EXT2_HASH_HALF_MD4 1 228 #define EXT2_HASH_TEA 2 229 #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 230 #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 231 #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 232 233 #define EXT2_HASH_FLAG_INCOMPAT 0x1 234 235 struct ext2_dx_entry { 236 __le32 hash; 237 __le32 block; 238 }; 239 240 struct ext2_dx_countlimit { 241 __le16 limit; 242 __le16 count; 243 }; 244 245 /* 246 * This goes at the end of each htree block. 247 */ 248 struct ext2_dx_tail { 249 __le32 dt_reserved; 250 __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */ 251 }; 252 253 /* 254 * Macro-instructions used to manage group descriptors 255 */ 256 #define EXT2_MIN_DESC_SIZE 32 257 #define EXT2_MIN_DESC_SIZE_64BIT 64 258 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 259 #define EXT2_DESC_SIZE(s) \ 260 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 261 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 262 263 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 264 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 265 #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 266 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 267 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 268 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 269 (EXT2_CLUSTER_SIZE(s) / \ 270 EXT2_BLOCK_SIZE(s))) 271 #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 272 #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 273 EXT2_INODES_PER_BLOCK(s)) 274 #ifdef __KERNEL__ 275 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 276 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 277 #else 278 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 279 #endif 280 281 #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \ 282 (g)) 283 #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \ 284 (g)) 285 286 /* 287 * Constants relative to the data blocks 288 */ 289 #define EXT2_NDIR_BLOCKS 12 290 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 291 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 292 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 293 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 294 295 /* 296 * Inode flags 297 */ 298 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 299 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 300 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 301 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 302 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 303 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 304 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 305 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 306 /* Reserved for compression usage... */ 307 #define EXT2_DIRTY_FL 0x00000100 308 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 309 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 310 /* nb: was previously EXT2_ECOMPR_FL */ 311 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */ 312 /* End compression flags --- maybe not all used */ 313 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 314 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 315 #define EXT2_IMAGIC_FL 0x00002000 316 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 317 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 318 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 319 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 320 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 321 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 322 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 323 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */ 324 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 325 #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 326 #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 327 #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 328 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */ 329 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 330 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 331 332 #define EXT2_FL_USER_VISIBLE 0x204BDFFF /* User visible flags */ 333 #define EXT2_FL_USER_MODIFIABLE 0x204B80FF /* User modifiable flags */ 334 335 /* 336 * ioctl commands 337 */ 338 339 /* Used for online resize */ 340 struct ext2_new_group_input { 341 __u32 group; /* Group number for this data */ 342 __u32 block_bitmap; /* Absolute block number of block bitmap */ 343 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 344 __u32 inode_table; /* Absolute block number of inode table start */ 345 __u32 blocks_count; /* Total number of blocks in this group */ 346 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 347 __u16 unused; /* Number of reserved GDT blocks in group */ 348 }; 349 350 struct ext4_new_group_input { 351 __u32 group; /* Group number for this data */ 352 __u64 block_bitmap; /* Absolute block number of block bitmap */ 353 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 354 __u64 inode_table; /* Absolute block number of inode table start */ 355 __u32 blocks_count; /* Total number of blocks in this group */ 356 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 357 __u16 unused; 358 }; 359 360 #ifdef __GNU__ /* Needed for the Hurd */ 361 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 362 #endif 363 364 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 365 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 366 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 367 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 368 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 369 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 370 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 371 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 372 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 373 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 374 375 /* 376 * Structure of an inode on the disk 377 */ 378 struct ext2_inode { 379 __u16 i_mode; /* File mode */ 380 __u16 i_uid; /* Low 16 bits of Owner Uid */ 381 __u32 i_size; /* Size in bytes */ 382 __u32 i_atime; /* Access time */ 383 __u32 i_ctime; /* Inode change time */ 384 __u32 i_mtime; /* Modification time */ 385 __u32 i_dtime; /* Deletion Time */ 386 __u16 i_gid; /* Low 16 bits of Group Id */ 387 __u16 i_links_count; /* Links count */ 388 __u32 i_blocks; /* Blocks count */ 389 __u32 i_flags; /* File flags */ 390 union { 391 struct { 392 __u32 l_i_version; /* was l_i_reserved1 */ 393 } linux1; 394 struct { 395 __u32 h_i_translator; 396 } hurd1; 397 } osd1; /* OS dependent 1 */ 398 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 399 __u32 i_generation; /* File version (for NFS) */ 400 __u32 i_file_acl; /* File ACL */ 401 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 402 __u32 i_faddr; /* Fragment address */ 403 union { 404 struct { 405 __u16 l_i_blocks_hi; 406 __u16 l_i_file_acl_high; 407 __u16 l_i_uid_high; /* these 2 fields */ 408 __u16 l_i_gid_high; /* were reserved2[0] */ 409 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 410 __u16 l_i_reserved; 411 } linux2; 412 struct { 413 __u8 h_i_frag; /* Fragment number */ 414 __u8 h_i_fsize; /* Fragment size */ 415 __u16 h_i_mode_high; 416 __u16 h_i_uid_high; 417 __u16 h_i_gid_high; 418 __u32 h_i_author; 419 } hurd2; 420 } osd2; /* OS dependent 2 */ 421 }; 422 423 /* 424 * Permanent part of an large inode on the disk 425 */ 426 struct ext2_inode_large { 427 __u16 i_mode; /* File mode */ 428 __u16 i_uid; /* Low 16 bits of Owner Uid */ 429 __u32 i_size; /* Size in bytes */ 430 __u32 i_atime; /* Access time */ 431 __u32 i_ctime; /* Inode Change time */ 432 __u32 i_mtime; /* Modification time */ 433 __u32 i_dtime; /* Deletion Time */ 434 __u16 i_gid; /* Low 16 bits of Group Id */ 435 __u16 i_links_count; /* Links count */ 436 __u32 i_blocks; /* Blocks count */ 437 __u32 i_flags; /* File flags */ 438 union { 439 struct { 440 __u32 l_i_version; /* was l_i_reserved1 */ 441 } linux1; 442 struct { 443 __u32 h_i_translator; 444 } hurd1; 445 } osd1; /* OS dependent 1 */ 446 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 447 __u32 i_generation; /* File version (for NFS) */ 448 __u32 i_file_acl; /* File ACL */ 449 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 450 __u32 i_faddr; /* Fragment address */ 451 union { 452 struct { 453 __u16 l_i_blocks_hi; 454 __u16 l_i_file_acl_high; 455 __u16 l_i_uid_high; /* these 2 fields */ 456 __u16 l_i_gid_high; /* were reserved2[0] */ 457 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 458 __u16 l_i_reserved; 459 } linux2; 460 struct { 461 __u8 h_i_frag; /* Fragment number */ 462 __u8 h_i_fsize; /* Fragment size */ 463 __u16 h_i_mode_high; 464 __u16 h_i_uid_high; 465 __u16 h_i_gid_high; 466 __u32 h_i_author; 467 } hurd2; 468 } osd2; /* OS dependent 2 */ 469 __u16 i_extra_isize; 470 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ 471 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 472 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 473 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 474 __u32 i_crtime; /* File creation time */ 475 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 476 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 477 __u32 i_projid; /* Project ID */ 478 }; 479 480 #define EXT4_INODE_CSUM_HI_EXTRA_END \ 481 (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \ 482 EXT2_GOOD_OLD_INODE_SIZE) 483 484 #define EXT4_EPOCH_BITS 2 485 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 486 487 #define i_dir_acl i_size_high 488 489 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 490 491 #define inode_includes(size, field) \ 492 (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \ 493 offsetof(struct ext2_inode_large, field))) 494 495 #if defined(__KERNEL__) || defined(__linux__) 496 #define i_reserved1 osd1.linux1.l_i_reserved1 497 #define i_frag osd2.linux2.l_i_frag 498 #define i_fsize osd2.linux2.l_i_fsize 499 #define i_uid_low i_uid 500 #define i_gid_low i_gid 501 #define i_uid_high osd2.linux2.l_i_uid_high 502 #define i_gid_high osd2.linux2.l_i_gid_high 503 #else 504 #if defined(__GNU__) 505 506 #define i_translator osd1.hurd1.h_i_translator 507 #define i_frag osd2.hurd2.h_i_frag; 508 #define i_fsize osd2.hurd2.h_i_fsize; 509 #define i_uid_high osd2.hurd2.h_i_uid_high 510 #define i_gid_high osd2.hurd2.h_i_gid_high 511 #define i_author osd2.hurd2.h_i_author 512 513 #endif /* __GNU__ */ 514 #endif /* defined(__KERNEL__) || defined(__linux__) */ 515 516 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 517 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 518 #define inode_projid(inode) ((inode).i_projid) 519 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 520 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 521 522 static inline 523 struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode) 524 { 525 return (struct ext2_inode *) large_inode; 526 } 527 528 /* 529 * File system states 530 */ 531 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 532 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 533 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 534 535 /* 536 * Misc. filesystem flags 537 */ 538 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 539 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 540 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 541 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 542 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 543 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 544 545 /* 546 * Mount flags 547 */ 548 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 549 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 550 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 551 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 552 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 553 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 554 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 555 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 556 557 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 558 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 559 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 560 EXT2_MOUNT_##opt) 561 /* 562 * Maximal mount counts between two filesystem checks 563 */ 564 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 565 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 566 567 /* 568 * Behaviour when detecting errors 569 */ 570 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 571 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 572 #define EXT2_ERRORS_PANIC 3 /* Panic */ 573 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 574 575 #if (__GNUC__ >= 4) 576 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 577 #else 578 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 579 #endif 580 581 /* Metadata checksum algorithms */ 582 #define EXT2_CRC32C_CHKSUM 1 583 584 /* Encryption algorithms, key size and key reference len */ 585 #define EXT4_ENCRYPTION_MODE_INVALID 0 586 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 587 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 588 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 589 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 590 591 #define EXT4_AES_256_XTS_KEY_SIZE 64 592 #define EXT4_AES_256_GCM_KEY_SIZE 32 593 #define EXT4_AES_256_CBC_KEY_SIZE 32 594 #define EXT4_AES_256_CTS_KEY_SIZE 32 595 #define EXT4_MAX_KEY_SIZE 64 596 597 #define EXT4_KEY_DESCRIPTOR_SIZE 8 598 #define EXT4_CRYPTO_BLOCK_SIZE 16 599 600 /* Password derivation constants */ 601 #define EXT4_MAX_PASSPHRASE_SIZE 1024 602 #define EXT4_MAX_SALT_SIZE 256 603 #define EXT4_PBKDF2_ITERATIONS 0xFFFF 604 605 #define EXT2_LABEL_LEN 16 606 607 /* 608 * Policy provided via an ioctl on the topmost directory. This 609 * structure is also in the kernel. 610 */ 611 struct ext4_encryption_policy { 612 char version; 613 char contents_encryption_mode; 614 char filenames_encryption_mode; 615 char flags; 616 char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE]; 617 } __attribute__((__packed__)); 618 619 struct ext4_encryption_key { 620 __u32 mode; 621 char raw[EXT4_MAX_KEY_SIZE]; 622 __u32 size; 623 } __attribute__((__packed__)); 624 625 /* 626 * Structure of the super block 627 */ 628 struct ext2_super_block { 629 __u32 s_inodes_count; /* Inodes count */ 630 __u32 s_blocks_count; /* Blocks count */ 631 __u32 s_r_blocks_count; /* Reserved blocks count */ 632 __u32 s_free_blocks_count; /* Free blocks count */ 633 __u32 s_free_inodes_count; /* Free inodes count */ 634 __u32 s_first_data_block; /* First Data Block */ 635 __u32 s_log_block_size; /* Block size */ 636 __u32 s_log_cluster_size; /* Allocation cluster size */ 637 __u32 s_blocks_per_group; /* # Blocks per group */ 638 __u32 s_clusters_per_group; /* # Fragments per group */ 639 __u32 s_inodes_per_group; /* # Inodes per group */ 640 __u32 s_mtime; /* Mount time */ 641 __u32 s_wtime; /* Write time */ 642 __u16 s_mnt_count; /* Mount count */ 643 __s16 s_max_mnt_count; /* Maximal mount count */ 644 __u16 s_magic; /* Magic signature */ 645 __u16 s_state; /* File system state */ 646 __u16 s_errors; /* Behaviour when detecting errors */ 647 __u16 s_minor_rev_level; /* minor revision level */ 648 __u32 s_lastcheck; /* time of last check */ 649 __u32 s_checkinterval; /* max. time between checks */ 650 __u32 s_creator_os; /* OS */ 651 __u32 s_rev_level; /* Revision level */ 652 __u16 s_def_resuid; /* Default uid for reserved blocks */ 653 __u16 s_def_resgid; /* Default gid for reserved blocks */ 654 /* 655 * These fields are for EXT2_DYNAMIC_REV superblocks only. 656 * 657 * Note: the difference between the compatible feature set and 658 * the incompatible feature set is that if there is a bit set 659 * in the incompatible feature set that the kernel doesn't 660 * know about, it should refuse to mount the filesystem. 661 * 662 * e2fsck's requirements are more strict; if it doesn't know 663 * about a feature in either the compatible or incompatible 664 * feature set, it must abort and not try to meddle with 665 * things it doesn't understand... 666 */ 667 __u32 s_first_ino; /* First non-reserved inode */ 668 __u16 s_inode_size; /* size of inode structure */ 669 __u16 s_block_group_nr; /* block group # of this superblock */ 670 __u32 s_feature_compat; /* compatible feature set */ 671 __u32 s_feature_incompat; /* incompatible feature set */ 672 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 673 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 674 char s_volume_name[EXT2_LABEL_LEN]; /* volume name */ 675 char s_last_mounted[64]; /* directory where last mounted */ 676 __u32 s_algorithm_usage_bitmap; /* For compression */ 677 /* 678 * Performance hints. Directory preallocation should only 679 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 680 */ 681 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 682 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 683 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 684 /* 685 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 686 */ 687 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 688 __u32 s_journal_inum; /* inode number of journal file */ 689 __u32 s_journal_dev; /* device number of journal file */ 690 __u32 s_last_orphan; /* start of list of inodes to delete */ 691 __u32 s_hash_seed[4]; /* HTREE hash seed */ 692 __u8 s_def_hash_version; /* Default hash version to use */ 693 __u8 s_jnl_backup_type; /* Default type of journal backup */ 694 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 695 __u32 s_default_mount_opts; 696 __u32 s_first_meta_bg; /* First metablock group */ 697 __u32 s_mkfs_time; /* When the filesystem was created */ 698 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 699 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 700 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 701 __u32 s_free_blocks_hi; /* Free blocks count */ 702 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 703 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 704 __u32 s_flags; /* Miscellaneous flags */ 705 __u16 s_raid_stride; /* RAID stride */ 706 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 707 __u64 s_mmp_block; /* Block for multi-mount protection */ 708 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 709 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 710 __u8 s_checksum_type; /* metadata checksum algorithm */ 711 __u8 s_encryption_level; /* versioning level for encryption */ 712 __u8 s_reserved_pad; /* Padding to next 32bits */ 713 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 714 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 715 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 716 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 717 snapshot's future use */ 718 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 719 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 720 __u32 s_error_count; /* number of fs errors */ 721 __u32 s_first_error_time; /* first time an error happened */ 722 __u32 s_first_error_ino; /* inode involved in first error */ 723 __u64 s_first_error_block; /* block involved of first error */ 724 __u8 s_first_error_func[32]; /* function where the error happened */ 725 __u32 s_first_error_line; /* line number where error happened */ 726 __u32 s_last_error_time; /* most recent time of an error */ 727 __u32 s_last_error_ino; /* inode involved in last error */ 728 __u32 s_last_error_line; /* line number where error happened */ 729 __u64 s_last_error_block; /* block involved of last error */ 730 __u8 s_last_error_func[32]; /* function where the error happened */ 731 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 732 __u8 s_mount_opts[64]; 733 __u32 s_usr_quota_inum; /* inode number of user quota file */ 734 __u32 s_grp_quota_inum; /* inode number of group quota file */ 735 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 736 __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */ 737 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 738 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 739 __le32 s_lpf_ino; /* Location of the lost+found inode */ 740 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 741 __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */ 742 __le32 s_reserved[98]; /* Padding to the end of the block */ 743 __u32 s_checksum; /* crc32c(superblock) */ 744 }; 745 746 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 747 748 /* 749 * Codes for operating systems 750 */ 751 #define EXT2_OS_LINUX 0 752 #define EXT2_OS_HURD 1 753 #define EXT2_OBSO_OS_MASIX 2 754 #define EXT2_OS_FREEBSD 3 755 #define EXT2_OS_LITES 4 756 757 /* 758 * Revision levels 759 */ 760 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 761 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 762 763 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 764 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 765 766 #define EXT2_GOOD_OLD_INODE_SIZE 128 767 768 /* 769 * Journal inode backup types 770 */ 771 #define EXT3_JNL_BACKUP_BLOCKS 1 772 773 /* 774 * Feature set definitions 775 */ 776 777 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 778 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 779 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 780 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 781 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 782 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 783 784 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 785 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 786 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 787 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 788 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 789 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 790 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 791 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ 792 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 793 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 794 795 796 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 797 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 798 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 799 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 800 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 801 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 802 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 803 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 804 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 805 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 806 /* 807 * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group 808 * descriptor checksums use the same algorithm as all other data 809 * structures' checksums. 810 */ 811 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 812 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800 813 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 814 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */ 815 #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000 816 817 818 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 819 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 820 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 821 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 822 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 823 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 824 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 825 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 826 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 827 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 828 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 829 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 830 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 831 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 832 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 833 834 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \ 835 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 836 { \ 837 return ((EXT2_SB(sb)->s_feature_compat & \ 838 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \ 839 } \ 840 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 841 { \ 842 EXT2_SB(sb)->s_feature_compat |= \ 843 EXT##ver##_FEATURE_COMPAT_##flagname; \ 844 } \ 845 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 846 { \ 847 EXT2_SB(sb)->s_feature_compat &= \ 848 ~EXT##ver##_FEATURE_COMPAT_##flagname; \ 849 } 850 851 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \ 852 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 853 { \ 854 return ((EXT2_SB(sb)->s_feature_ro_compat & \ 855 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \ 856 } \ 857 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 858 { \ 859 EXT2_SB(sb)->s_feature_ro_compat |= \ 860 EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ 861 } \ 862 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 863 { \ 864 EXT2_SB(sb)->s_feature_ro_compat &= \ 865 ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ 866 } 867 868 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \ 869 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 870 { \ 871 return ((EXT2_SB(sb)->s_feature_incompat & \ 872 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \ 873 } \ 874 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 875 { \ 876 EXT2_SB(sb)->s_feature_incompat |= \ 877 EXT##ver##_FEATURE_INCOMPAT_##flagname; \ 878 } \ 879 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 880 { \ 881 EXT2_SB(sb)->s_feature_incompat &= \ 882 ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \ 883 } 884 885 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC) 886 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES) 887 EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL) 888 EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR) 889 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE) 890 EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX) 891 EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG) 892 EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP) 893 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2) 894 895 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER) 896 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE) 897 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE) 898 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM) 899 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK) 900 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE) 901 EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT) 902 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA) 903 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC) 904 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM) 905 EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA) 906 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY) 907 EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT) 908 EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS) 909 910 EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION) 911 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE) 912 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER) 913 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV) 914 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG) 915 EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS) 916 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT) 917 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP) 918 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG) 919 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE) 920 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA) 921 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED) 922 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR) 923 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA) 924 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT) 925 926 #define EXT2_FEATURE_COMPAT_SUPP 0 927 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 928 EXT4_FEATURE_INCOMPAT_MMP) 929 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 930 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 931 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 932 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 933 934 /* 935 * Default values for user and/or group using reserved blocks 936 */ 937 #define EXT2_DEF_RESUID 0 938 #define EXT2_DEF_RESGID 0 939 940 /* 941 * Default mount options 942 */ 943 #define EXT2_DEFM_DEBUG 0x0001 944 #define EXT2_DEFM_BSDGROUPS 0x0002 945 #define EXT2_DEFM_XATTR_USER 0x0004 946 #define EXT2_DEFM_ACL 0x0008 947 #define EXT2_DEFM_UID16 0x0010 948 #define EXT3_DEFM_JMODE 0x0060 949 #define EXT3_DEFM_JMODE_DATA 0x0020 950 #define EXT3_DEFM_JMODE_ORDERED 0x0040 951 #define EXT3_DEFM_JMODE_WBACK 0x0060 952 #define EXT4_DEFM_NOBARRIER 0x0100 953 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 954 #define EXT4_DEFM_DISCARD 0x0400 955 #define EXT4_DEFM_NODELALLOC 0x0800 956 957 /* 958 * Structure of a directory entry 959 */ 960 #define EXT2_NAME_LEN 255 961 962 struct ext2_dir_entry { 963 __u32 inode; /* Inode number */ 964 __u16 rec_len; /* Directory entry length */ 965 __u16 name_len; /* Name length */ 966 char name[EXT2_NAME_LEN]; /* File name */ 967 }; 968 969 /* 970 * The new version of the directory entry. Since EXT2 structures are 971 * stored in intel byte order, and the name_len field could never be 972 * bigger than 255 chars, it's safe to reclaim the extra byte for the 973 * file_type field. 974 * 975 * This structure is deprecated due to endianity issues. Please use struct 976 * ext2_dir_entry and accessor functions 977 * ext2fs_dirent_name_len 978 * ext2fs_dirent_set_name_len 979 * ext2fs_dirent_file_type 980 * ext2fs_dirent_set_file_type 981 * to get and set name_len and file_type fields. 982 */ 983 struct ext2_dir_entry_2 { 984 __u32 inode; /* Inode number */ 985 __u16 rec_len; /* Directory entry length */ 986 __u8 name_len; /* Name length */ 987 __u8 file_type; 988 char name[EXT2_NAME_LEN]; /* File name */ 989 }; 990 991 /* 992 * This is a bogus directory entry at the end of each leaf block that 993 * records checksums. 994 */ 995 struct ext2_dir_entry_tail { 996 __u32 det_reserved_zero1; /* Pretend to be unused */ 997 __u16 det_rec_len; /* 12 */ 998 __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */ 999 __u32 det_checksum; /* crc32c(uuid+inode+dirent) */ 1000 }; 1001 1002 /* 1003 * Ext2 directory file types. Only the low 3 bits are used. The 1004 * other bits are reserved for now. 1005 */ 1006 #define EXT2_FT_UNKNOWN 0 1007 #define EXT2_FT_REG_FILE 1 1008 #define EXT2_FT_DIR 2 1009 #define EXT2_FT_CHRDEV 3 1010 #define EXT2_FT_BLKDEV 4 1011 #define EXT2_FT_FIFO 5 1012 #define EXT2_FT_SOCK 6 1013 #define EXT2_FT_SYMLINK 7 1014 1015 #define EXT2_FT_MAX 8 1016 1017 /* 1018 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we 1019 * have to build ext2_dir_entry_tail with that assumption too. This 1020 * constant helps to build the dir_entry_tail to look like it has an 1021 * "invalid" file type. 1022 */ 1023 #define EXT2_DIR_NAME_LEN_CSUM 0xDE00 1024 1025 /* 1026 * EXT2_DIR_PAD defines the directory entries boundaries 1027 * 1028 * NOTE: It must be a multiple of 4 1029 */ 1030 #define EXT2_DIR_ENTRY_HEADER_LEN 8 1031 #define EXT2_DIR_PAD 4 1032 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 1033 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + \ 1034 EXT2_DIR_ENTRY_HEADER_LEN + \ 1035 EXT2_DIR_ROUND) & \ 1036 ~EXT2_DIR_ROUND) 1037 1038 /* 1039 * Constants for ext4's extended time encoding 1040 */ 1041 #define EXT4_EPOCH_BITS 2 1042 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 1043 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 1044 1045 /* 1046 * This structure is used for multiple mount protection. It is written 1047 * into the block number saved in the s_mmp_block field in the superblock. 1048 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown 1049 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem, 1050 * regardless of how old the timestamp is. 1051 * 1052 * The timestamp in the MMP structure will be updated by e2fsck at some 1053 * arbitary intervals (start of passes, after every few groups of inodes 1054 * in pass1 and pass1b). There is no guarantee that e2fsck is updating 1055 * the MMP block in a timely manner, and the updates it does are purely 1056 * for the convenience of the sysadmin and not for automatic validation. 1057 * 1058 * Note: Only the mmp_seq value is used to determine whether the MMP block 1059 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname 1060 * fields are only for informational purposes for the administrator, 1061 * due to clock skew between nodes and hostname HA service takeover. 1062 */ 1063 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1064 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1065 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1066 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1067 1068 /* Not endian-annotated; it's swapped at read/write time */ 1069 struct mmp_struct { 1070 __u32 mmp_magic; /* Magic number for MMP */ 1071 __u32 mmp_seq; /* Sequence no. updated periodically */ 1072 __u64 mmp_time; /* Time last updated */ 1073 char mmp_nodename[64]; /* Node which last updated MMP block */ 1074 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1075 __u16 mmp_check_interval; /* Changed mmp_check_interval */ 1076 __u16 mmp_pad1; 1077 __u32 mmp_pad2[226]; 1078 __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1079 }; 1080 1081 /* 1082 * Default interval for MMP update in seconds. 1083 */ 1084 #define EXT4_MMP_UPDATE_INTERVAL 5 1085 1086 /* 1087 * Maximum interval for MMP update in seconds. 1088 */ 1089 #define EXT4_MMP_MAX_UPDATE_INTERVAL 300 1090 1091 /* 1092 * Minimum interval for MMP checking in seconds. 1093 */ 1094 #define EXT4_MMP_MIN_CHECK_INTERVAL 5 1095 1096 /* 1097 * Minimum size of inline data. 1098 */ 1099 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS)) 1100 1101 /* 1102 * Size of a parent inode in inline data directory. 1103 */ 1104 #define EXT4_INLINE_DATA_DOTDOT_SIZE (4) 1105 1106 #endif /* _LINUX_EXT2_FS_H */ 1107
